The Warblers are rehearsing Misery. Later, after the mascot Pavorotti suddenly dies, the Warblers sing back-up for Kurt in Blackbird. At a Warbler meeting, Blaine proposes a duet between him and Kurt, which they all support. The Warblers compete at Regionals, but lose to New Directions. (Original Song)

It is revealed by Sebastian that the Warblers have won their Sectionals. They are later seen in the audience, watching the New Directions perform at their Sectionals. (Hold on to Sixteen)

The New Directions learn that Sebastian has stolen their setlist idea for Regionals, and confront him and the Warblers in a parking garage where they sing Bad, which ends in Blaine getting injured. The Warblers are confronted several more times throughout the episode, which ends in mutual amends during a performance of Black or White. (Michael)

The Warblers dedicate their Regionals performance to David Karofsky and are seen cheering on their opponents. They came in second to the New Directions. (On My Way)

Sue reveals that the Warblers have been named the winners at Sectionals. (Swan Song)

Sam and Blaine begin investigating the Warblers, suggesting that they cheated at Sectionals. They present evidence to Finn Hudson, believing that the Warblers have been using human growth hormones. They later get former Warbler Trent to confirm their suspicions. (Sadie Hawkins)

It's revealed on the news that the Warblers have been disqualified for illegal steroid use, allowing New Directions to move on to Regionals. (Naked)

Blaine has become the new coach of the Warblers after his break-up with Kurt and left New York. He brings Rachel to Dalton to sing Sing in hopes of cheering her up. (Loser Like Me)

Jane Hayward approaches Blaine and convinces him to let her audition to join the Warblers, much to the other members' dismay. The glee club then allows her to show her talent before making the decision. Jane blows the crowd away with Tightrope, but despite her breathtaking performance, the council voted against her, causing her to transfer to McKinley and join New Directions. (Homecoming)

Dalton Academy burns to the ground, and Blaine is extended an invitation from Kurt, Rachel, and Will to have the Warblers join the New Directions. They accept, but soon butt heads with Jane, Kitty, and Madison when they refuse to let go of their Warbler blazers. A compromise is reached by Blaine by creating Red Warbler Blazers as a symbol of both schools. The Warblers finally dissolve into New Directions as a unified club as they perform Rise in their new uniforms. (The Rise and Fall of Sue Sylvester)

During Season Two, it was seen that, since the Warblers didn't have a director, a council was in charge of accepting new members and choosing songs for competitions. But, in the next three seasons, this council was no longer active and a captain had those responsibilities (Sebastian in the third and fifth seasons, and Hunter in the fourth season). However, the council was reinstated between Season Five and Season Six, as it is seen in Homecoming.